GDP growth and inflation forecasting performance of Asian Development Outlook
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1 and inflation forecasting performance of Asian Development Outlook Asian Development Outlook (ADO) has been the flagship publication of the Asian Development Bank (ADB) since Issued twice a year since 1999 both in April, the main ADO, and in September,1 the ADO Update the publication contains country economic data and analysis, and projections of key macroeconomic variables. It provides important context for ADB s policy dialogue with its member countries and other stakeholders, and guides ADB management in its views on important development and economic issues. Since its inception, the April issue of ADO has provided currentand next-year forecasts for a range of macroeconomic aggregates; the September release also does this, and analyzes the performance of each developing member country (DMC) during the first half of the year. This second evaluation of the forecasting performance of ADO for real gross domestic product (GDP) growth and inflation the first was in ADO 26 Update provides an update. It expands coverage from nine to 14 DMCs, enabling analysis not only across DMCs but also across three subregions (East Asia, South Asia, and Southeast Asia). Additional sample points are added for 26. Measuring forecasting quality This evaluation again centers on the forecasting errors of real GDP growth and inflation. Current- and next-year forecasts for 14 DMCs, from 199 to 26, are considered. (The 14 DMCs are Bangladesh; People s Republic of China [PRC]; Hong Kong, China; India; Indonesia; Republic of Korea; Malaysia; Pakistan; Philippines; Singapore; Sri Lanka; Taipei,China; Thailand; and Viet Nam.) Forecasts released in April and in September are also compared with each other. The forecast errors are benchmarked against Consensus Economics forecasts for the period 2 26 (i.e., after the Asian financial crisis that began in 1997). As a measure of the accuracy of forecasts, the size of the forecast error the difference between the actual value and the forecast for a given year is used. As both April and September releases of ADO are used in this investigation, two sets of current- and next-year forecasts are shown. For example, the April current-year forecast error in GDP growth in 26 is the difference between actual growth in 26 and the forecast made in ADO 26; the September current-year forecast error is the difference between actual growth in 26 and the forecast made in ADO 26 Update. Similarly, the April next-year forecast error is the difference between actual growth in 26 and the forecast made in ADO 2; the September next-year forecast error is the difference between actual growth in
2 13 Asian Development Outlook 27 Update 26 and the forecast made in ADO 2 Update. Positive forecast errors indicate underprediction and negative forecast errors indicate overprediction. The current-year forecasts provided in September should be considered only partial forecasts as they already draw on some information on outcomes. Self-evidently, more information for a given calendar year is available in September than in April that year: first-half GDP estimates and up to 7 months of inflation data are available for most DMCs. Three measures of accuracy and bias are considered in this investigation: mean absolute error (MAE), root-mean-square error (RMSE), and fraction of positive errors (FPE). Mean error, a common measure of forecast accuracy and bias, is not used in this evaluation as it is sensitive to the sign of the error: positive and negative values cancel and give misleading results. It is for this reason that MAE and RMSE are used, which cumulate errors irrespective of their arithmetic sign. Low values for these two measures indicate greater accuracy. Of the two, the RMSE gives greater weight to large forecast errors. With regard to FPE, a result higher than. indicates a general tendency for the forecasts to underpredict actual values; conversely, a figure lower than. indicates a tendency to overpredict. Additional tests are applied to detect whether there is a systematic bias in the sign of the forecasting error and to assess the forecasts ability to predict changes in direction. Ideally, exposure to more information should result in a smaller forecast error, i.e., greater accuracy. This suggests that the current-year forecast error ought to be smaller than that for the next year. Similarly, September current- and next-year forecast errors should be smaller than April errors (since by that time more information is available). In addition, a shorter forecast horizon (and therefore less uncertainty) should not only result in greater accuracy on average but also less variance in the prediction. This suggests that the variance of the currentyear forecast error should be lower than that for the next year. Similarly, for both the current- and next-year forecasts, the variance of the September forecast errors should be smaller than April s. Forecasting record of April issue of ADO Tables and report summary statistics for the forecast errors for both current- and next-year forecasts for and inflation for each of 14 DMCs, grouped by subregion. The MAE, RMSE, FPE, and standard deviation are shown. Current-year forecasts. For, the mean of the current-year forecast error (i.e., the bias averaged across time and across DMCs) in absolute terms is 1.6 percentage points. Singapore posted the largest absolute forecast error, at 2. percentage points, followed by Hong Kong, China and Malaysia, at 2.2 percentage points. Although Singapore showed the highest MAE, Malaysia had the highest RMSE, indicating a greater number of large forecast errors. Indeed, the current-year forecast errors
3 Technical notes and inflation forecasting performance Descriptive statistics for forecast errors of, April issue of ADO, Mean absolute error Root-meansquare error Fraction of positive errors Standard deviation Current-year forecast * 2.38 East Asia * 2.62 China, People s Rep. of * 1.7 Hong Kong, China Korea, Rep. of Taipei,China South Asia * 1.1 Bangladesh India Pakistan Sri Lanka Southeast Asia * 2.67 Indonesia * 2.88 Malaysia * 3.49 Philippines Singapore * 3.11 Thailand Viet Nam * 1.39 Next-year forecast East Asia China, People s Rep. of * 2.77 Hong Kong, China Korea, Rep. of Taipei,China South Asia Bangladesh India Pakistan Sri Lanka Southeast Asia * 4.18 Indonesia Malaysia Philippines Singapore Thailand Viet Nam Note: For fraction of positive errors, * indicates statistical significance at the % level, based on the sign test. The sign test can be used to examine if one random variable in a pair (X, Y) tends to be larger than the other variable. In this study, the two random variables are the forecast and actual outcome. The null hypothesis is that the forecast is more likely to overpredict actual growth. for Malaysia displayed the highest variability, with a standard deviation of 3. percentage points. By subregion, South Asia posted the lowest MAE. A particularly high FPE (more than 7%) is observed for PRC, Indonesia, Malaysia, Singapore, and Viet Nam. The preponderance of DMCs with an FPE above. suggests a tendency for GDP forecasts in April s ADO to underpredict current-year. This is supported by the sign test, which rejects the null hypothesis of likely overprediction. Only the Republic of Korea and Taipei,China have FPEs lower than.. For the former, the MAE was affected when growth was greatly overpredicted for 1998, a year in which the economy experienced a
4 132 Asian Development Outlook 27 Update Descriptive statistics for forecast errors of inflation, April issue of ADO, Mean absolute error Root-meansquare error Fraction of positive errors Standard deviation Current-year forecast * 4.31 East Asia * 2.4 China, People s Rep. of * 4.3 Hong Kong, China * 1.79 Korea, Rep. of * 1.28 Taipei,China * 1.29 South Asia Bangladesh India Pakistan Sri Lanka Southeast Asia *.74 Indonesia Malaysia *.67 Philippines Singapore *.87 Thailand Viet Nam Next-year forecast East Asia * 3.99 China, People s Rep. of * 6.77 Hong Kong, China * 3.3 Korea, Rep. of Taipei,China South Asia Bangladesh India Pakistan Sri Lanka Southeast Asia Indonesia Malaysia * 1. Philippines Singapore * 1.29 Thailand Viet Nam Note: See note to Table For the sign test, the null hypothesis is that the forecast is more likely to underpredict actual inflation. severe contraction in the Asian financial crisis. For the latter, GDP growth was greatly overpredicted in 21, but the economy contracted because of an export slump in the information and communication technology sector. Note that the general trend of underpredicting remains even if the crisis years are deleted from the evaluation and the resulting negative bias for these years is removed from the forecasts. Without the crisis years, the FPE increases to.67, from.63. Next-year forecasts. The MAE and the RMSE are, as might be expected, larger for next- than current-year forecasts. MAEs range from.71 to 3.41 percentage points, with Singapore again posting the highest
5 Technical notes and inflation forecasting performance 133 MAE. But Indonesia has the highest RMSE, and consequently the highest standard deviation. The PRC has a preponderance of positive errors for next-year forecasts: GDP forecasts are underpredicted 82% of the time. In contrast, FPEs are very low for Pakistan (.24), Bangladesh (.29), Taipei,China (.3), and Philippines (.3). (But there is a strong tendency to underpredict for both current- and next-year forecasts for PRC, India, Indonesia, Malaysia, Singapore, Thailand, and Viet Nam.) As next-year forecasts are more susceptible to unexpected economic developments, they are made with less certainty and confidence than current-year forecasts; consequently, errors are more volatile. The standard deviations (many of them above 2 percentage of next-year forecast errors are greater than those of the current year. The increase of the spread in errors between the current- and next-year forecasts for many economies also appears quite large. As an example, the standard deviation of the forecast errors in Indonesia and the Philippines almost doubles. Current-year forecasts. During the early part of the 199s, more than half the 14 DMCs under consideration experienced double-digit inflation: PRC; Hong Kong, China; India; Indonesia, Pakistan; Philippines; Sri Lanka; and Viet Nam. Viet Nam and Indonesia recorded the two highest inflation rates: 83% for the former in 1991 and 8.% for the latter in In a separate calculation (the results of which are not shown in a table), for Viet Nam, current-year inflation estimates were, on average, above outcomes by almost percentage points. This is largely explained by the gross overestimation of inflation in 2 years, 199 and 1991 improved supply conditions in 1991 helped lower inflation in that year. Indonesia s current-year inflation forecasts, on the other hand, were underpredicted on average by 3 percentage points largely driven by the failure to predict the sharp increase in prices during the Asian financial crisis and in 2 when fuel subsidies were unexpectedly cut. In terms of the more robust measures of MAE and RMSE, it is still these two DMCs that top the list: Viet Nam s forecasts are more than three times as high as the overall MAE and RMSE of, respectively, 2.2 and 3.3 percentage points, and Indonesia s are two to three times as high. Viewed as a whole, more than 6% of the DMCs forecast errors are negative, suggesting a general tendency of current-year forecasts of April s ADO to overpredict inflation. Again this is supported by the sign test, which rejects the null hypothesis that the forecasts are more likely to underpredict inflation. The FPEs are generally low, ranging from.6 to.9, and only India and Indonesia have an FPE of more than.. The same general trend again holds even if the crisis years are removed from the analysis: the forecasts are still overestimated more than 6% of the time but the MAE, RMSE, and standard deviation are smaller. Next-year forecasts. The same overprediction tendency is seen for next-year forecasts: April s ADO overestimates inflation 4% of the time on average. In addition, the MAE, RMSE, and standard deviation of next-year forecasts are higher than current-year forecasts.
6 134 Asian Development Outlook 27 Update April versus September forecasts Table shows, for 12 DMCs, the MAE, FPE, and standard deviation of forecast errors for and inflation for both April and September forecasts for and inflation. (Bangladesh and Pakistan are not included as the current fiscal year for these DMCs is ended by the time the September issue of ADO, the ADO Update, is released. The current-year forecasts for and inflation published in ADO Update for these two DMCs are already actual growth and inflation figures.) September MAEs of both current- and next-year forecast errors are overall lower than April forecast errors. This general picture also holds at a subregional level. However, slight increases of MAE in September are observed for Indonesia (current-year forecasts); and for India; Philippines; Taipei,China; and Viet Nam (next-year forecasts). Current-year forecasts in all DMCs except the PRC and Viet Nam have smaller variances for September forecast errors. Furthermore, the reduction in the variance between April and September is quite large. For example, the standard deviation of the current-year forecast error in Sri Lanka falls from 2.67 percentage points in April to.31 percentage points in September, representing an 88% reduction. Overall, the standard deviation of current-year forecast errors decreases by 6%. The same general pattern exists for the next-year forecast errors, but it is less pronounced. For the entire sample, the September forecast has a smaller standard deviation, declining by 11% relative to April. Again, Sri Lanka posted the highest reduction in the dispersion of its forecasts, the September standard deviation being 7% lower than that of April. The larger reduction in the spread of errors in the current-year forecasts suggests that information gathered between April and September benefits the current-year forecasts more than the next-year forecasts. As a whole, the FPE increases from April to September. This is true for both current- and next-year forecasts. Although forecasts are generally underpredicted (as shown by an FPE above., regardless of whether current- or next-year, and date of reporting), this underprediction becomes more pronounced when figures for the first half of the year are known. No obvious explanation exists for this. MAEs for the September release of inflation forecasts are smaller than in the April release. This is true irrespective of subregion and whether a current- or next-year forecast. Of the 12 DMCs evaluated, only India posted a slight increase in the September MAE of its next-year forecasts. In general, additional information gathered between April and September helps the accuracy of the forecasts. The improvement, as measured by the reduction in MAE, is more pronounced in currentthan next-year forecasts. A larger reduction of the MAE is observed for inflation forecasts than forecasts. This may be because GDP is harder to predict, as it is determined by a host of factors and is a lower frequency variable than inflation.
7 Technical notes and inflation forecasting performance Descriptive statistics for forecast errors, April and September issues of ADO, 2 26 Mean absolute error Standard deviation Fraction of positive errors April Sep April Sep April Sep Current-year forecast East Asia China, People s Rep. of Hong Kong, China Korea, Rep. of Taipei,China South Asia India Sri Lanka Southeast Asia Indonesia Malaysia Philippines Singapore Thailand Viet Nam Next-year forecast East Asia China, People s Rep. of Hong Kong, China Korea, Rep. of Taipei,China South Asia India Sri Lanka Southeast Asia Indonesia Malaysia Philippines Singapore Thailand Viet Nam Current-year forecast East Asia China, People s Rep. of Hong Kong, China Korea, Rep. of Taipei,China South Asia India Sri Lanka Southeast Asia Indonesia Malaysia Philippines Singapore Thailand Viet Nam Next-year forecast East Asia China, People s Rep. of Hong Kong, China Korea, Rep. of Taipei,China South Asia India Sri Lanka Southeast Asia Indonesia Malaysia Philippines Singapore Thailand Viet Nam
8 136 Asian Development Outlook 27 Update Further, all the standard deviations of April current-year forecast errors are higher than September s. For September revisions to the current-year estimate, the standard deviations fall by 48%. Next-year forecast errors also see a reduction. In terms of FPE, for both April and September, the majority of forecast errors are negative, i.e., they display a tendency for inflation forecasts to be too high. This proportion is about 6 73% for current-year forecasts, and about % for next-year forecasts. Accuracy of forecasting over time Figure plots the MAE of forecasts over time. The MAE was estimated through a simple cross-sectional average of all DMCs absolute forecast errors for each year. To ensure a similar number of DMCs across the years, only the forecasts in the April ADO were considered. The solid line refers to the MAE and the dashed lines to values of the absolute prediction error at less than and at more than one sample standard deviation, estimated for each year. A smaller gap between the solid line and dashed lines indicates more tightly distributed forecast errors. Forecast accuracy for appears to have gradually improved over time (if one ignores the sharp rise in forecast errors in the crisis years). Not only are forecast errors declining, but they have also been characterized by lower variance in recent years. A similar exercise was undertaken for inflation. As shown in Figure 4.1.2, MAEs of current- and next-year forecasts have declined in recent years. This would indicate greater forecast accuracy after the crisis years, and even better than the quality of forecasts prior to the crisis. The trend of the RMSE also improves (Figure 4.1.3). For inflation, a large part of the improvement in overall forecast accuracy is due to the substantial decrease in the forecast errors for Bangladesh, PRC, Indonesia, Sri Lanka, and Viet Nam. Improved forecast accuracy The progress in forecast quality is attributable not only to learning effects but also to the gradual stability seen in the overall macroeconomic environment, and access to higher-quality data. Recent years in developing Asia have been characterized by stable growth, as well as lower average inflation. Improvements in national statistical systems in several DMCs have also increased timely access to more reliable macroeconomic data. Growth and turning points Earlier sections assessed the quality of forecasting by the size of prediction errors. This section assesses quality in terms of the accuracy of prediction about the direction of change. In the case of growth, Mean absolute error of forecasts, April issue of ADO Current-year forecast Next-year forecast Mean absolute error +/- 1 standard deviation Click here for figure data Mean absolute error of inflation forecasts, April issue of ADO Current-year forecast Next-year forecast Mean absolute error +/- 1 standard deviation Click here for figure data
9 Technical notes and inflation forecasting performance 137 a good forecast should be able to discriminate between a positive change in growth (or acceleration) and a negative change in growth (or deceleration). This test is relevant as some short- to mediumterm business decisions are influenced by expectations of whether the immediate macroeconomic outlook is better or worse than current conditions. Pooling data across years and DMCs reveals that the April issue of ADO has correctly predicted the direction of current-year forecasts for about 7% of the time since 199; for next-year forecasts, the corresponding figure is 64%. These statements are true even if the crisis years are excluded from the evaluation. Accuracy of directional forecast tends to be negatively associated with the pace of growth (Figure 4.1.4). The strength of a forecast to discriminate between an acceleration and a deceleration may also be measured by applying the Hansen-Kuiper s discriminant score (HK), defined here as: HK = A(g) FA(g), where A(g) is the proportion of accelerations (including no change in growth) that have been correctly forecast to occur, while FA(g) is the proportion of decelerations that have been falsely forecast. It ranges between -1 and 1. A score of 1 indicates perfect forecasting, while -1 means that all forecasts are incorrect. Referring to Table 4.1.4, A(g) is computed as A R /(A R +A W ) while FA(g) is estimated as D W /(D W +D R ) Root-mean-square error of GDP growth and inflation forecasts, April issue of ADO Current year Next year Click here for figure data Contingency table for actual and predicted outcomes Acceleration Actual Deceleration Predicted Acceleration A R D W Deceleration A W D R The HK has a desirable property: forecasts that uniformly predict only a single outcome, say a good event, will score zero, provided that there is at least one bad event. Thus, a forecast that predicts acceleration throughout will have an A(g) equal to 1, but also an FA(g) equal to 1, and thus an HK that is equal to. However, if events of only one kind occur and they are correctly predicted, the HK score will be 1. Results are shown in Table Not surprisingly, current-year forecasts perform better on the HK test than next-year forecasts. Except for South Asia (i.e., India and Sri Lanka), September forecasts do better than those in April. Generally, predictions are best for East Asia. Although the accuracy of the 4.1. Hansen-Kuiper s discriminant score,, April and September issues of ADO All East Asia South Asia Southeast Asia April issue Current year: ,.4,.48.9,.6.,.2.34, Next year: , ,.27.32,.27.34,.2.22,.26 September issue Current year: Next year: Accuracy of direction of, April issue of ADO, Current year Next year Korea, Rep. of Taipei,China Pakistan Hong Kong, China Bangladesh Philippines Singapore Sri Lanka Thailand Malaysia Indonesia India Viet Nam China, People's Rep. of Correct forecasts (%) Click here for figure data
10 138 Asian Development Outlook 27 Update direction for predicted is relatively weak for the PRC, it is quite good for Hong Kong, China; Republic of Korea; and Taipei,China. Using a contingency table, tests of association between predicted and actual growth can be conducted. Table reports two types of measures the Pearson chi-square test and phi coefficient applied on current- and next-year forecasts over the period Results of the chi-square test reject the null hypothesis of no association between predicted and actual growth. To examine the type and degree of association, the phi coefficient is used here. It is a special case of the correlation coefficient applied to binary variables, ranging from +1 (positive association) to -1 (negative association). The phi coefficients again show a stronger positive correlation between forecast and actual growth in current- than next-year forecasts. The current-year phi coefficient (not shown) for East Asia, at.6, Tests of association,, April issue of ADO, Actual Current-year Next-year Accel. Decel. Total Accel. Decel. Total Acceleration Predicted Deceleration Total Pearson chi-square P-value for Pearson.. chi-square Phi coefficient.4.28 is also higher than those for South Asia (.) and Southeast Asia (.3), suggesting better forecast quality in East Asia (at least on this measure). ADO and Consensus Economics forecasts A comparison of the April issue of ADO and Consensus Economics forecast errors suggests that ADO has a better track record on growth (especially in South Asia) but Consensus Economics performs slightly better on inflation (particularly East Asia and Southeast Asia; Table 4.1.7). However, there is little statistical significance in these differences, and it is not possible to trace directly the reasons for them. Consensus Economics forecasts seem to fare better for DMCs with deeper financial markets and for monetary rather than real variables. The apparent lack of significant differences between ADO and Consensus Economics forecasts may be observed from Figure Most of the scatter points lie very close to the 4 line, showing a fairly high level of correlation between the two sets of forecasts. This is most evident in current-year GDP forecasts. Conclusions Even with the expanded dataset (from nine to 14 DMCs) and use of additional statistical tests, findings similar to those in ADO 26 Update 4.1. April ADO and Consensus Economics forecasts (%), 2 26 Current year Asian Development Outlook Next year Asian Development Outlook Current year - 1 Asian Development Outlook Next year - 1 Asian Development Outlook East Asia Southeast Asia South Asia Sources: Consensus Economics Inc., Asia Pacific Consensus Forecasts, various years; staff calculations. Click here for figure data Consensus Economics Consensus Economics Consensus Economics Consensus Economics
11 Technical notes and inflation forecasting performance Average differences between April ADO and Consensus Economics forecasts, 2 26 Indicator All East Asia South Asia Southeast Asia Growth Average difference in mean absolute errors Current year: F ADO - F Consensus -. (-.74).12 (.76) -.2 (-3.29)*** -.1 (-.17) Next year: F ADO - F Consensus -. (-.).16 (1.41) -.14 (-1.3). (.3) Average difference in mean absolute errors Current year: F ADO - F Consensus.7 (.9).27 (3.8)*** -.43 (-3.4)**.26 (2.64)** Next year: F ADO - F Consensus.2 (.17).23 (1.8)* -.17 (-.7).3 (.2) Note: ***, **, and * indicate that the average differences are significant at 1%, %, and %, respectively. A negative coefficient means that the ADO forecast has a lower mean absolute error than the Consensus Economics forecast. Values in parentheses are t-statistics. emerge. First, there is a tendency for ADO to underpredict growth and overpredict inflation. Second, forecast accuracy has improved over time. Other points are salient. ADO has a fairly high level of accuracy, not only in terms of predicting the magnitude of change, but also in terms of forecasting the direction of change. Still, forecast accuracy tends to vary across DMCs as well as subregions. Accuracy has also been and is likely to remain susceptible to shocks. Endnote 1 The main ADO appears in March or April, and the Update in August or September. For the sake of simplicity, April and September are used.
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